I think the Switchwords aspect of your question is not relevant because Switchwords are just condensed affirmations, and a normal affirmation is really just a statement of intent anyway.

So what you're really asking is whether someone can pick up on your intent to heal them.

First off, I'd say it's generally not a good policy to help people who are not asking for help in some way. It's a bit like giving advice to someone who isn't asking for advice. I'm sure just about everyone has been in that situation (on the receiving or giving end) at some point or another and discovered what an unpleasant experience that can be for all concerned.

When people are ready for advice and they believe you can help them, they'll ask you. Only then give it to them. Similarly with (absent) healing, if someone wants it and believes you can help them, they'll ask you.

Helping people who are not asking for help is rather disempowering to them. It's an attempt to deprive them of an experience that they are choosing to have, and an attempt to make them dependent on you for their own connection to their "Source".

Obviously, in an attraction-based universe, you are not going to be able to impose your healing upon them, but you can still get yourself embroiled in vibrational attitudes that are not healthy for you. This is because it's an implication that you believe there is something wrong with them and you are going to fix it for them.

That attitude of "You need fixing" isn't a particularly good one to hold when dealing with anyone...especially since we are infinite multi-dimensional beings that don't need fixing...and even more especially since everyone else in your reality is just a reflection of you anyway - but that's another story and not what you're currently asking about :)

I've previously mentioned my own absent healing experiences and how unexpected the results can be when not asked for. See Can we send our energy remotely to other people? And, as mentioned there, while you can send the energy, it's still up to them how (or if) they choose to use it.

Coming specifically to your question, and concern, about whether someone could sense it's you sending the healing, I've personally been able to sense in the past when specific people have held an ill-intent towards me but not when they've had a good-intent towards me. For me, that "good energy" comes through anonymously. Others who are more vibrationally sensitive than me might have had different experiences but that's just what I've found (up to now).

But I'd ask you why are you worried about this at all?

Put the absent healing aspect to one side for a moment and consider how your bully would react if you gave him/her a million dollars? Or a new car? Or some other unexpected gift?

Would they really be angry with you for doing so? :)

I've found over a few years with messing with this stuff that a better attitude to hold if you genuinely want to be of benefit to others ("heal them" if you prefer) is to Let Your Inner Light Shine. Be who you really are. Be the best "You" that you can be. Reach your potential. Demonstrate through example.

In that way, you'll inspire others who come into contact with you (physically or vibrationally) to their own connections for themselves rather than trying to fix them into place and making them dependent upon you.

As the old saying goes: "Give a man a fish and you'll feed him for a day. Teach a man how to fish...and you can sell him fishing equipment." ...or something like that :)